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WO2017084046A1 - Procédé de transmission de signal, procédé de détection de signal, et dispositif et système associés - Google Patents

Procédé de transmission de signal, procédé de détection de signal, et dispositif et système associés Download PDF

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Publication number
WO2017084046A1
WO2017084046A1 PCT/CN2015/094923 CN2015094923W WO2017084046A1 WO 2017084046 A1 WO2017084046 A1 WO 2017084046A1 CN 2015094923 W CN2015094923 W CN 2015094923W WO 2017084046 A1 WO2017084046 A1 WO 2017084046A1
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WIPO (PCT)
Prior art keywords
signal
spread spectrum
modulation
branch
subcarrier
Prior art date
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Ceased
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PCT/CN2015/094923
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English (en)
Chinese (zh)
Inventor
黄远达
李良川
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201580084184.7A priority Critical patent/CN108352903B/zh
Priority to PCT/CN2015/094923 priority patent/WO2017084046A1/fr
Priority to EP15908543.0A priority patent/EP3367593B1/fr
Publication of WO2017084046A1 publication Critical patent/WO2017084046A1/fr
Priority to US15/982,930 priority patent/US10374722B2/en
Anticipated expiration legal-status Critical
Priority to US16/517,214 priority patent/US10958352B2/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/5161—Combination of different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7087—Carrier synchronisation aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/697—Arrangements for reducing noise and distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/005—Optical Code Multiplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2569—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to polarisation mode dispersion [PMD]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/7097—Direct sequence modulation interference
    • H04B2201/709709—Methods of preventing interference

Definitions

  • the present invention relates to the field of communications, and in particular, to a signal transmitting method, a signal receiving method, and related devices and systems.
  • Baseband signals are generally not suitable for long-distance transmission on various channels due to transmission distortion, transmission loss, and the like.
  • it is necessary to perform corresponding carrier modulation to shift its signal spectrum to a high frequency, making it a form suitable for long-distance channel transmission.
  • carrier modulation can be performed by digital modulation methods such as QPSK (Quadrature Phase Shift Keying) and 16QAM (Quadrature Amplitude Modulation).
  • digital modulation methods such as QPSK (Quadrature Phase Shift Keying) and 16QAM (Quadrature Amplitude Modulation).
  • QPSK Quadrature Phase Shift Keying
  • 16QAM Quadrature Amplitude Modulation
  • signal modulation begins to progress toward higher order QAM.
  • the ENOB Effective Number of Bits
  • the high-speed DAC Digital to Analog Converter
  • the back-to-back BER Bit Error Rate
  • the transmitter may include a light source, a multi-carrier generating device, a demultiplexer, an polarization-multiplexed IQ (In-phase, in-phase, quadrature, quadrature) modulator, a coupler, and the like.
  • a light source a multi-carrier generating device
  • a demultiplexer an polarization-multiplexed IQ (In-phase, in-phase, quadrature, quadrature) modulator
  • a coupler and the like.
  • the working principle of the transmitter is: after the light source generates a continuous optical carrier of a certain wavelength, multi-wavelength is generated by the multi-carrier generating device, and then demultiplexed into multiple sub-carriers by the demultiplexer, and then based on the high-speed data signal Multi-channel low-speed baseband IQ signal obtained by corresponding conversion to each subcarrier Polarization multiplexed IQ modulation is performed separately, and finally, the modulated subcarrier signals are combined and output through a coupler.
  • the high baud rate data signal can be converted into multiple low baud rate data signals by multi-subcarrier multiplexing, so that only low bandwidth devices (such as low bandwidth DACs) are needed. Other electrical devices with low bandwidth, etc.) can process and transmit the corresponding data signals. Since low-bandwidth DACs are generally easier to obtain higher ENOBs, resulting in less quantization noise, and other devices with lower bandwidths typically have less electrical noise, this approach can improve higher-order QAM systems. reliability. However, since the multi-carrier generating apparatus and the demultiplexer required in this manner can still be implemented only in a relatively complicated and high-cost manner, there are problems such as implementation complexity and high cost, which cannot be truly commercialized.
  • the transmitter may include a pulse light source, a DPSK (Differential Phase Shift Keying) encoder, a phase modulator, a spectral phase encoder, etc.;
  • the working principle is: the DPSK encoder generates a differential coded signal according to the input signal and outputs it to the phase modulator; the phase modulator phase modulates the optical carrier generated by the pulse light source according to the differential coded signal, and outputs the modulated signal to the spectral phase encoder.
  • the modulated signal is phase modulated by a spectral phase coder to achieve spread spectrum.
  • the spectral phase coder when performing phase modulation, needs to divide the signal into multiple spectral components and phase modulate the spectral components according to different optical phase shifts, wherein each optical phase shift is usually caused by multiple
  • the delay unit is generated or generated by a controllable phase unit formed by lithium niobate or its equivalent electro-optic material.
  • the modulation signal can be phase-modulated by the spectral phase coder to achieve spread spectrum to improve the reliability of the QAM system.
  • this method usually requires multiple delay units or controllable phase units to generate corresponding optical phase shifts to achieve spread spectrum, resulting in a more complex implementation, higher cost, and no real commercialization.
  • the existing methods for improving the reliability of the QAM system have problems such as high cost and difficulty in implementation. Therefore, it is urgent to provide a new way to solve the above problems.
  • the embodiments of the present invention provide a signal transmitting method, a signal receiving method, and related devices and systems, so as to solve the problems of high cost and difficult implementation in the existing methods for improving the reliability of the QAM system.
  • a signal transmission method comprising:
  • the N-channel spreading code and the N-channel subcarrier are a one-to-one correspondence
  • the N low-speed data signals are in a one-to-one correspondence with the N-channel subcarriers
  • the N low-speed data signals are obtained by serial-to-parallel conversion of the received high-speed data signals
  • the obtained N-way modulated spread spectrum signals are combined into one combined signal output.
  • data modulation and amplitude spread spectrum modulation are performed on the N subcarriers according to the N low speed data signal and the N way spreading code, to obtain an N path.
  • Modulating the spread spectrum signal including:
  • the N-channel low-speed data signal and the N-channel spreading code are used for performing data modulation and amplitude-spreading modulation on the N-channel subcarriers to obtain an N-channel.
  • Modulating the spread spectrum signal including:
  • a modulated spread spectrum signal corresponding to the subcarrier is obtained.
  • the N-channel low-speed data signal and the N-way spreading code are used for performing data modulation and amplitude spread spectrum modulation on the N-channel subcarriers to obtain an N-channel.
  • Modulating the spread spectrum signal including:
  • the path subcarrier performs data modulation to obtain a second branch data modulation signal, and performs amplitude spread spectrum modulation on the second branch data modulated signal according to the inverted one channel spreading code corresponding to the subcarrier. Obtaining a second branch modulation spread spectrum signal; and,
  • the N-channel low-speed data signal and the N-channel spreading code are used to perform data modulation and amplitude spread spectrum modulation on the N-channel subcarriers to obtain an N-channel.
  • Modulating the spread spectrum signal including:
  • Performing amplitude spread spectrum modulation on the first branch subcarrier according to a one-way spreading code corresponding to the subcarrier, to obtain a first branch spread spectrum signal, and according to one low speed data corresponding to the subcarrier Transmitting, by the signal, data modulation on the first branch spread spectrum signal to obtain a first branch modulated spread spectrum signal; and according to a reverse spreading code corresponding to the subcarrier after inversion, the second branch subcarrier Amplitude spread spectrum modulation is performed to obtain a second branch spread spectrum signal, and according to the inverted and the subcarriers a low-speed data signal corresponding to the wave, performing data modulation on the second-branch spread spectrum signal to obtain a second-branch modulated spread spectrum signal;
  • a signal receiving method including:
  • the signal transmitting device splits the generated single-wavelength optical carrier into sub-carriers of the same N wavelength by using the shunting device, and is based on the N low-speed data signal and the N-way spread spectrum a code, performing data modulation and amplitude spread spectrum modulation on the N-channel subcarriers, obtaining an N-way modulated spread spectrum signal, and combining the N-channel modulated spread spectrum signals;
  • the N is a positive integer not less than 2.
  • the method further includes:
  • Adaptive filtering is performed on each of the N data signals to obtain N adaptively filtered data signals.
  • the method further includes:
  • the method before the de-spreading the digital signal, the method further includes:
  • Dispersion compensation is performed on the digital signal.
  • a signal transmitting device including a light source, a serial-to-parallel converter, a first branching device, a first combining device, and N modulation and spreading devices, wherein the value of N is not less than 2.
  • N is not less than 2.
  • the light source is configured to generate a single wavelength optical carrier and output to the first branching device
  • the serial-to-parallel converter is configured to convert and convert the received high-speed data signal string into N low-speed data signals, and output the signals to the N modulated spread spectrum devices; wherein the N low-speed data signals are N modulation spread spectrum devices have a one-to-one correspondence;
  • the first branching device is configured to split a single-wavelength optical carrier generated by the light source into N-channel subcarriers with the same wavelength, and output the same to the N modulated spread spectrum devices; wherein the N-channel subcarriers and The N modulation and spread spectrum devices have a one-to-one correspondence;
  • Each of the N modulated spread spectrum devices modulates a spread spectrum device for respectively performing a modulated spread spectrum device according to a low speed data signal corresponding to the modulation spread spectrum device and an N way spread code Corresponding one-way spreading code, performing data modulation and amplitude spread spectrum modulation on the sub-carrier corresponding to the modulation and spread spectrum device, obtaining a modulated spread spectrum signal corresponding to the modulated spread spectrum device, and outputting to the first a combined device; wherein the N-channel spreading code has a one-to-one correspondence with the N modulation and spreading devices;
  • the first combining device is configured to combine the N modulated spectral spread signals received from the N modulation and spread spectrum devices into one combined signal output.
  • the spread spectrum device is modulated for any one of the N modulation spread spectrum devices, where the one modulation spread spectrum device is specifically configured to:
  • the spread spectrum device is modulated for any one of the N modulation and spread spectrum devices, where the one modulation spread spectrum device is specifically configured to:
  • the spread spectrum device is modulated for any one of the N modulation and spread spectrum devices, where the one modulation spread spectrum device is specifically configured to:
  • the road data modulation signal is subjected to amplitude spread spectrum modulation to obtain a second branch modulated spread spectrum signal; and, the first branch modulated spread spectrum signal and the second branch modulated spread spectrum signal are combined to obtain
  • the one channel of the modulation spread spectrum device modulates the spread spectrum signal and outputs the signal to the first combining device.
  • the spread spectrum device is modulated for any one of the N modulation and spread spectrum devices, where the one modulation spread spectrum device is specifically configured to:
  • Corresponding one low-speed data signal performs data modulation on the first-branch spread spectrum signal to obtain a first-branch modulated spread spectrum signal
  • one-way spreading code corresponding to the one modulated spread spectrum device according to the reverse phase Performing amplitude spread spectrum modulation on the second branch subcarrier to obtain a second branch spread spectrum a signal, and performing data modulation on the second branch spread spectrum signal according to the inverted one-way low-speed data signal corresponding to the one modulation spread spectrum device to obtain a second branch modulated spread spectrum signal
  • the first branch modulated spread spectrum signal and the second branch modulated spread spectrum signal are combined to obtain a modulated spread spectrum signal corresponding to the one modulated spread spectrum device, and output to the first combined path device.
  • the N way spreading codes are mutually orthogonal bipolar binary spreading sequences.
  • a signal receiving device including an OEC (Optical to Electrical Converter), an ADC (Analog to Digital Converter), and a DSP (Digital Signal Processor):
  • OEC Optical to Electrical Converter
  • ADC Analog to Digital Converter
  • DSP Digital Signal Processor
  • the OEC is configured to receive a signal transmitted by a signal transmitting device, and convert the received signal into an electrical signal and output the signal to the ADC; wherein the signal is generated by a signal transmitting device using a shunt device
  • the N-channel sub-carrier is subjected to data modulation and amplitude-spreading modulation based on the N-way low-speed data signal and the N-way spreading code to obtain an N-channel modulated spread spectrum signal. And combining the N-way modulated spread spectrum signals;
  • the ADC is configured to receive an electrical signal output by the OEC, and convert the electrical signal into a digital signal and output the signal to the DSP;
  • the DSP is configured to receive a digital signal output by the ADC, and despread the digital signal based on the N-channel spreading code to obtain an N-channel despread signal, and in the N-channel despread signal Each despread signal is low-pass filtered to obtain N data signals; the N is a positive integer not less than 2.
  • the DSP further includes a multiple input multiple output filter:
  • the MIMO filter is configured to adaptively filter each of the N data signals to obtain N adaptively filtered data signals.
  • the DSP is further included N phase restorers including one-to-one correspondence with the N-channel adaptively filtered data signals:
  • Each of the N phase restorers is configured to perform carrier phase recovery on an adaptively filtered data signal corresponding to the phase restorer to obtain a data signal after phase recovery of the carrier.
  • the DSP further includes a dispersion compensator:
  • the dispersion compensator is configured to perform dispersion compensation on the received digital signal before despreading the received digital signal, and output a dispersion-compensated digital signal to the N despreaders .
  • a signal transmission system including a signal transmitting device and a signal receiving device;
  • the signal transmitting device is configured to generate a single-wavelength optical carrier, and split the single-wavelength optical carrier into N-channel subcarriers with the same wavelength based on the shunting device, and according to the N low-speed data signal and the N-way spreading code.
  • N is a positive integer not less than 2
  • the N-way spreading code has a one-to-one correspondence with the N-channel subcarriers
  • the N-way low-speed data signal has a one-to-one correspondence with the N-channel subcarriers.
  • the N low-speed data signals are obtained by serial-to-parallel conversion of the received high-speed data signals;
  • the signal receiving device is configured to receive a signal transmitted by the signal transmitting device, perform photoelectric conversion and analog digital conversion processing on the received signal, obtain a digital signal, and, based on the N-channel spreading code pair
  • the digital signal is despread to obtain an N-way despread signal, and each of the N despread signals is low-pass filtered to obtain an N-channel data signal.
  • the generated single-wavelength optical carrier can be split into N sub-carriers having the same wavelength by the branching device. And using N low-speed data signals obtained by serial-to-parallel conversion of the received high-speed data signals, and N-way spreading codes to perform corresponding data modulation and amplitude on the N-channel subcarriers The spread spectrum modulation is obtained to obtain an N-way modulated spread spectrum signal, and the N-channel modulated spread spectrum signals are combined and output.
  • low-speed DACs with high ENOB and other low-bandwidth electrical devices can be used for data signal processing, which can effectively reduce the quantization noise and other electrical appliances of the DAC.
  • the electrical noise of the piece improves the performance of the high-order QAM modulation system.
  • the optical carrier when the optical carrier is split, it is not necessary to use a multi-carrier generating device and a multi-channel allocator having a complicated structure, and when performing spreading, it is not necessary to adopt a plurality of delay units or
  • the phase modulation mode of the controllable phase unit can effectively solve the problems of high cost and difficult implementation in the existing methods for improving the reliability of the QAM system on the basis of improving the reliability of the system.
  • FIG. 1 is a schematic structural diagram of a transmitter according to the prior art 1;
  • FIG. 2 is a schematic structural diagram of a transmitter described in the prior art 2;
  • FIG. 3 is a schematic flowchart diagram of a signal transmission method according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic flowchart of a signal receiving method according to Embodiment 2 of the present invention.
  • FIG. 5 is a schematic structural diagram of a signal transmitting apparatus according to Embodiment 3 of the present invention.
  • FIG. 6 is a schematic structural diagram of implementation of a first type of signal transmitting apparatus according to Embodiment 3 of the present invention.
  • FIG. 7 is a schematic structural diagram of an implementation of a second type of signal transmitting apparatus according to Embodiment 3 of the present invention.
  • FIG. 8 is a schematic structural diagram of an implementation of a third type of signal transmitting apparatus according to Embodiment 3 of the present invention.
  • FIG. 9 is a schematic structural diagram of a fourth type of signal transmitting apparatus according to Embodiment 3 of the present invention. intention;
  • FIG. 10 is a schematic structural diagram of a signal receiving apparatus according to Embodiment 4 of the present invention.
  • FIG. 11 is a schematic structural diagram of an implementation of a first type of DSP according to Embodiment 4 of the present invention.
  • FIG. 12 is a schematic structural diagram of an implementation of a second type of DSP according to Embodiment 4 of the present invention.
  • FIG. 13 is a schematic structural diagram of an implementation of a third DSP according to Embodiment 4 of the present invention.
  • FIG. 14 is a schematic structural diagram of implementation of a fourth DSP according to Embodiment 4 of the present invention.
  • FIG. 15 is a schematic structural diagram of a signal transmission system according to Embodiment 5 of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the first embodiment of the present invention provides a signal transmitting method. Specifically, as shown in FIG. 3, it is The schematic diagram of the signal transmission method in the first embodiment of the present invention, the signal transmission method may specifically include the following steps:
  • Step 301 Generate a single wavelength optical carrier.
  • Step 302 The split-wavelength device is used to split the single-wavelength optical carrier into N-channel subcarriers with the same wavelength, and the value of the N is a positive integer not less than 2.
  • Step 303 Perform data modulation and amplitude spread spectrum modulation on the N-channel subcarrier according to the N low-speed data signal and the N-channel spreading code to obtain an N-channel modulated spread spectrum signal; the N-channel spreading code and the N
  • the path subcarriers have a one-to-one correspondence, the N low speed data signals have a one-to-one correspondence with the N way subcarriers, and the N low speed data signals are obtained by serial-to-parallel conversion of the received high-speed data signals. ;
  • Step 304 Combine the obtained N-channel modulated spread spectrum signals into one combined signal output.
  • the single-wavelength optical carrier can be split into N sub-carriers having the same wavelength by the branching device, and according to the N-way low-speed data signal and the N-way spreading code,
  • the N-channel subcarrier performs data modulation and amplitude spread spectrum modulation to obtain an N-channel modulated spread spectrum signal, and combines the N-channel modulated spread spectrum signals into one combined signal output. Since multiplexing can reduce the baud rate of each data signal, low-speed DACs with high ENOB and other low-bandwidth electrical devices can be used for data signal processing, which can effectively reduce the quantization noise and other electrical appliances of the DAC.
  • the electrical noise of the piece improves the performance of the high-order QAM modulation system.
  • the optical carrier can be split by using a relatively simple splitting device, without using a multi-carrier generating device with a relatively complicated structure, and when performing spreading, It is not necessary to adopt a phase modulation method that requires multiple delay units or controllable phase units, so as to improve the reliability of the system, the existing methods for improving the reliability of the system have higher cost and are difficult to implement. problem.
  • the branching device may be any branching device capable of splitting a single-wavelength optical carrier into multiple sub-carriers having the same wavelength, such as a coupler or a splitter, which is not limited in this embodiment of the present invention. .
  • N-channel modulated spread spectrum signal which can be performed as follows:
  • N-channel modulated spread spectrum signal which can also be implemented as:
  • a modulated spread spectrum signal corresponding to the subcarrier is obtained.
  • the sequence of data modulation and amplitude spread spectrum modulation of the subcarriers may be flexibly changed. For example, data modulation may be performed on the subcarriers first. The amplitude spread spectrum modulation is performed. The amplitude modulation and modulation of the subcarriers may be performed first, and then the data is modulated. This is not limited in this embodiment of the present invention.
  • the subcarriers may be split into two branch subcarriers to implement data modulation and respectively. Spreading to obtain two-channel modulated spread spectrum signals, and combining the two-channel modulated spread spectrum signals to obtain a one-way modulated spread spectrum signal corresponding to the sub-carriers.
  • the N-channel sub-carrier is subjected to data modulation and amplitude-spreading modulation to obtain an N-way modulated spread spectrum signal, which can also be implemented as:
  • phase shifting so that the phase difference between the two subcarriers is a set value (the set value can be flexibly set according to actual conditions, such as 180 degrees, etc.);
  • the path subcarrier performs data modulation to obtain a second branch data modulation signal, and performs amplitude spread spectrum modulation on the second branch data modulated signal according to the inverted one channel spreading code corresponding to the subcarrier. Obtaining a second branch modulation spread spectrum signal; and,
  • the subcarriers are split into a first branch subcarrier and a second branch subcarrier, and respectively, for the first branch subcarrier And the second branch subcarrier is phase-shifted, so that the phase difference between the two sub-carriers is a set value, and the data can be modulated and spread by the two sub-carriers in the following manner to obtain the One-way modulated spread spectrum signal corresponding to the subcarrier:
  • Performing amplitude spread spectrum modulation on the first branch subcarrier according to a one-way spreading code corresponding to the subcarrier, to obtain a first branch spread spectrum signal, and according to one low speed data corresponding to the subcarrier Transmitting, by the signal, data modulation on the first branch spread spectrum signal to obtain a first branch modulated spread spectrum signal; and according to a reverse spreading code corresponding to the subcarrier after inversion, the second branch subcarrier Performing amplitude spread spectrum modulation to obtain a second branch spread spectrum signal, and performing data modulation on the second branch spread spectrum signal according to the inverted one channel low speed data signal corresponding to the subcarrier Two-way modulated spread spectrum signal; and,
  • the order of the data modulation and the amplitude spread spectrum modulation can be flexibly changed, and the embodiment of the present invention does not limit this.
  • phase shifting the first branch subcarrier and the second branch subcarrier respectively so that a phase difference between the two subcarriers is the setting
  • the value can be specifically implemented as:
  • phase of the first branch subcarrier may also be phase shifted by 90 degrees, and the second branch subcarrier may be phase shifted by -90 degrees;
  • the first branch subcarrier is phase-shifted by -90 degrees, and the second branch subcarrier is phase-shifted by 90 degrees, etc., as long as the phase difference between the two subcarriers is 180 degrees, this embodiment of the present invention Do not repeat them.
  • N-way spreading codes described in the embodiments of the present invention may be mutually orthogonal bipolar binary spreading sequences.
  • each of the N-way spreading codes may be a real sequence such as a Walsh code or an OVSF code; of course, in order to obtain a more uniform spectrum, each of the spreading codes may also be based on a setting.
  • the pseudo random sequence code is a sequence code generated by scrambling a real sequence such as a Walsh code or an OVSF code, and the like, which is not limited in this embodiment of the present invention.
  • the execution body of the signal transmitting method in the embodiment of the present invention may be a corresponding signal transmitting device, which is not described in detail in the embodiments of the present invention.
  • the generated single-wavelength optical carrier can be split into N sub-carriers having the same wavelength by the branching device, and the received high-speed data signals are serially combined. Converting the obtained N low-speed data signals and N-channel spreading codes to perform corresponding data modulation and amplitude spread spectrum modulation on the N-channel subcarriers to obtain N-channel modulated spread spectrum signals, and then performing the N-channel modulated spread spectrum signals. Combine and output. Since multiplexing can reduce the baud rate of each data signal, low-speed DACs with high ENOB and other low-bandwidth electrical devices can be used for data signal processing, which can effectively reduce the quantization noise and other electrical appliances of the DAC.
  • the electrical noise of the piece improves the performance of the high-order QAM modulation system.
  • the optical carrier when the optical carrier is split, it is not necessary to use a multi-carrier generating device and a multi-channel allocator having a complicated structure, and when performing spreading, it is not necessary to adopt a plurality of delay units or
  • the phase modulation mode of the controllable phase unit can effectively solve the problems of high cost and difficult implementation in the existing methods for improving the reliability of the QAM system on the basis of improving the reliability of the system.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • a second embodiment of the present invention provides a signal receiving method. Specifically, as shown in FIG. 4, it is a schematic flowchart of a signal receiving method according to Embodiment 2 of the present invention.
  • the signal receiving method may specifically include the following steps. :
  • Step 401 Receive a signal transmitted by a signal transmitting device, where the signal transmitting device splits the generated single-wavelength optical carrier into sub-carriers with the same N-wavelength by using the shunting device, based on the N-channel low-speed data signal and the N a channel spreading code, performing data modulation and amplitude spread spectrum modulation on the N-channel subcarriers, obtaining an N-way modulated spread spectrum signal, and combining the N-channel modulated spread spectrum signals;
  • Step 402 Perform photoelectric conversion and analog-to-digital conversion processing on the received signal to obtain a digital signal.
  • Step 403 De-spread the digital signal based on the N-channel spreading code to obtain an N-channel despread signal, and perform low-pass filtering on each despread signal in the N-channel despread signal to obtain N.
  • Road data signal; the N is a positive integer not less than 2.
  • the digital signal can be solved based on the N-channel spreading code used by the signal transmitting device for amplitude spread spectrum modulation. Expand to improve the accuracy of data recovery and reception.
  • the despreading of the signal may be implemented by separately multiplying each of the N-channel spreading codes and the digital signal to obtain an N-channel despread signal. I won't go into details here.
  • N-way spreading codes may be mutually orthogonal bipolar binary spreading sequences.
  • each of the N-channel spreading codes may be a real sequence such as a Walsh code or an OVSF code; of course, in order to obtain a more uniform spectrum, each of the spreading codes may also be set based.
  • the pseudo-random sequence code is a sequence code generated by scrambling a real sequence such as a Walsh code or an OVSF code, and the like, which is not limited in this embodiment of the present invention.
  • the orthogonality between the paths may be destroyed, thereby generating Multiple access crosstalk, etc., so the method may also include:
  • Adaptive filtering is performed on each of the N data signals to obtain N adaptively filtered data signals to improve data recovery and reception accuracy.
  • the method may further include:
  • the method may further include:
  • Dispersion compensation is performed on the digital signal to eliminate the influence of dispersion on the digital signal, thereby further improving the accuracy of data recovery and reception.
  • Embodiment 2 of the present invention is mainly
  • the body can be a corresponding signal receiving device, which is not described in detail in the embodiments of the present invention.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • a third embodiment of the present invention provides a signal transmitting device.
  • FIG. 5 it is a schematic structural diagram of a signal transmitting device according to Embodiment 3 of the present invention.
  • the signal transmitting device may include a light source 51, a serial-to-parallel converter 52, a first branching device 53, a first combining device 54, and N modulation and spreading devices 55, and the value of the N is a positive integer not less than 2, where:
  • the light source 51 can be used to generate a single wavelength optical carrier, and output to the first branching device 53;
  • the serial-to-parallel converter 52 is configured to convert the received high-speed data signal string into N low-speed data signals and output the signals to the N modulation spread spectrum devices 55; wherein the N low-speed data signals and The N modulation and spread spectrum devices 55 have a one-to-one correspondence;
  • the first branching device 53 can be configured to split the single-wavelength optical carrier generated by the light source 51 into N-channel subcarriers with the same wavelength, and output the same to the N modulation and spreading devices 55; wherein, the N The path subcarriers have a one-to-one correspondence with the N modulation and spreading devices 55;
  • Each of the N modulation and spread spectrum devices 55, the modulation and spread spectrum device 55 can be used to respectively perform a modulation according to a low-speed data signal corresponding to the modulation and spread spectrum device 55 and an N-way spreading code.
  • the first spreading code corresponding to the spread spectrum device 55 performs data modulation and amplitude spread modulation on the subcarrier corresponding to the modulation and spread spectrum device 55 to obtain a modulation spread spectrum corresponding to the modulation and spread spectrum device 55.
  • the signal is output to the first combining device 54; wherein the N-channel spreading code has a one-to-one correspondence with the N modulation and spreading devices;
  • the first combining device 54 can be configured to combine the N modulated spread spectrum signals received from the N modulation and spreading devices 55 into one combined signal output.
  • the generated single-wavelength optical carrier it can be split into N sub-carriers having the same wavelength by the branching device, and N low-speed data signals obtained by serial-to-parallel conversion of the received high-speed data signals are used.
  • the N-channel spreading code performs corresponding data modulation and amplitude spread spectrum modulation on the N-channel subcarriers to obtain an N-channel modulated spread spectrum signal, and then combines and outputs the N-channel modulated spread spectrum signals.
  • multiplexing can reduce the baud rate of each data signal, it can be used High ENOB low-speed DACs and other low-bandwidth electrical devices are used to process the data signals, which can effectively reduce the quantization noise of the DAC and the electrical noise of other electrical components, and improve the performance of the high-order QAM modulation system.
  • the delay modulation unit or the phase modulation mode of the controllable phase unit can effectively solve the existing high cost and difficult implementation in the way of improving the reliability of the QAM system on the basis of improving the reliability of the system. problem.
  • the light source 51 can be a single-wavelength LED light source, a laser light source, or the like capable of generating a single-wavelength optical carrier
  • the first branching device 53 can be a coupler, a splitter, etc. capable of single-wavelength light.
  • the carrier is split into a plurality of arbitrary branching devices having subcarriers of the same wavelength
  • the first combining device 54 may be a coupler or a combiner capable of combining the N modulated and spread spectrum signals into one modulated spread spectrum Any combination of the signals is not limited in any way in the embodiments of the present invention.
  • the spread spectrum device 55 is modulated for any one of the N modulation spread spectrum devices, and the one modulation spread spectrum device 55 may be specifically configured to:
  • the spread spectrum device 55 is modulated for any one of the N modulation spread spectrum devices, and the one modulation spread spectrum device 55 is further specifically configured to:
  • the frequency-spreading device 55 first performs data modulation on the sub-carriers and then performs amplitude-spreading on the sub-carriers, and may perform amplitude-spreading on the sub-carriers before performing data modulation to increase data processing flexibility. No longer.
  • the one modulation and spread spectrum device 55 may specifically include a modulator and a spreader;
  • the modulator is configured to perform data modulation on a subcarrier corresponding to the one modulation spread spectrum device 55 according to a low speed data signal corresponding to the one modulation spread spectrum device 55, and output a data modulation signal Up to the spreader, the spread modulation unit performs amplitude spread modulation on the data modulation signal according to a spread code corresponding to the one modulation spread spectrum device 55, and outputs a modulated spread spectrum signal to a first combining device 54 (specifically, as shown in FIG.
  • the spreader can be configured to receive, by the modulator, data modulation on a subcarrier corresponding to the one modulation spread spectrum device 55 according to a low speed data signal corresponding to the one modulation spread spectrum device 55. And obtaining a data modulation signal, performing amplitude-spreading modulation on the data modulation signal according to a one-way spreading code corresponding to the one modulation and spreading device 55, and outputting the modulated spread spectrum signal to the first combining device 54 (specifically, as shown in FIG.
  • the modulator performs data modulation on the spread spectrum signal according to a low-speed data signal corresponding to the one modulation spread spectrum device 55, and outputs modulation
  • the spread spectrum signal is sent to the first combining device 54 (specifically, as shown in FIG. 7).
  • the XI, XQ, YI, and YQ signals shown in FIG. 6 or FIG. 7 are the low-speed data signals obtained by serial-to-parallel conversion of the high-speed data signals by the serial-to-parallel converter 52, and Code is the corresponding expansion.
  • the frequency code is not described in detail in the embodiment of the present invention.
  • each modulation and spreading device 55 may be PDM-QAM, single-bias QAM, PAM, etc., of course, any other modulation device capable of implementing corresponding data modulation.
  • the spreader included in each modulation and spread spectrum device 55 may be MZM or the like.
  • any other amplitude spread spectrum modulation can be implemented (the amplitude modulation of the subcarriers is implemented to achieve The spread spectrum device of the spread spectrum is not described in detail in the embodiments of the present invention.
  • the subcarriers may be split into two.
  • the branch subcarriers respectively implement data modulation and spread spectrum to obtain two-branch modulated spread spectrum signals, and combine the two-branch modulated spread spectrum signals to obtain one-way modulation corresponding to the sub-carriers.
  • Spread spectrum signal in addition to data modulation and spreading of any one of the subcarriers as a whole to obtain one modulated spread spectrum signal, the subcarriers may be split into two.
  • the branch subcarriers respectively implement data modulation and spread spectrum to obtain two-branch modulated spread spectrum signals, and combine the two-branch modulated spread spectrum signals to obtain one-way modulation corresponding to the sub-carriers.
  • the spread spectrum device 55 is modulated for any one of the N modulation spread spectrum devices, and the one modulation spread spectrum device 55 may also be specifically used for:
  • Corresponding one-way spreading code performing amplitude-spreading modulation on the first branch data modulated signal to obtain a first branch-modulated spread spectrum signal; and corresponding to the one modulated spread spectrum device 55 according to the inverse
  • a low-speed data signal performs data modulation on the second branch sub-carrier to obtain a second branch data modulation signal, and according to the inverted one-way spreading code corresponding to the one modulation and spreading device 55,
  • the second branch data modulation signal is subjected to amplitude spread spectrum modulation to obtain a second branch modulated spread spectrum signal; and the first branch modulated spread spectrum signal and the second branch modulated spread spectrum signal are combined a path corresponding to the one modulation spread spectrum device 55
  • the spread spectrum signal is modulated and output to the first combining device 54.
  • the subcarrier is split into a first subcarrier and a second subcarrier, and the first subcarrier is respectively
  • the second branch subcarrier is phase-shifted so that the phase difference between the two subcarriers is a set value (the set value can be flexibly set according to actual conditions, such as can be set to 180 degrees, etc.), the one modulation
  • the spread spectrum device 55 can also be specifically used for:
  • the first branch spread spectrum signal is data modulated by a corresponding low speed data signal corresponding to the device 55 to obtain a first branch modulated spread spectrum signal; and corresponding to the one modulation spread spectrum device 55 according to the reverse phase a spreading code, performing amplitude spread spectrum modulation on the second branch subcarrier to obtain a second branch spread spectrum signal, and according to the inverted low speed data signal pair corresponding to the one modulation spread spectrum device 55 Performing data modulation on the second branch spread spectrum signal to obtain a second branch modulated spread spectrum signal; and combining the first branch modulated spread spectrum signal and the second branch modulated spread spectrum signal A one-way modulated spread spectrum signal corresponding to the one modulation spread spectrum device 55 is obtained and output to the first combining device 54.
  • the order of the data modulation and the amplitude spread spectrum modulation can be flexibly changed, and the embodiment of the present invention does not limit this.
  • the one modulation and spread spectrum device 55 may include a second branching device, a phase shifter, a first two-electrode modulator, and a second two-electrode modulator. And a second combined device;
  • the second branching device may be configured to split a subcarrier corresponding to the one modulation and spreading device 55 into a first branch subcarrier and a second branch subcarrier;
  • the phase shifter may be configured to phase-shift the first branch subcarrier and the second branch subcarrier respectively, so that a phase difference between the two branch subcarriers is a set value, such as 180 degrees;
  • the first dual-electrode modulator can be configured to perform data modulation on the first branch subcarrier according to a low-speed data signal corresponding to the one modulation and spreading device 55, to obtain a first branch number. And modulating the signal, and performing amplitude-spreading modulation on the first branch data modulation signal according to a one-way spreading code corresponding to the one modulation and spreading device 55, to obtain a first branch-modulated spread spectrum signal (specific Or as shown in FIG.
  • the second dual-electrode modulator is configured to perform data modulation on the second branch subcarrier according to a reversed one-way low-speed data signal corresponding to the one modulation and spread spectrum device 55, to obtain a second branch data. Modulating a signal, and performing amplitude-spreading modulation on the second branch data modulated signal according to the inverted one-way spreading code corresponding to the one modulation and spreading device 55, to obtain a second branch modulation spread spectrum a signal (specifically, as shown in FIG.
  • the second combining device can be configured to combine the first branch modulated spread spectrum signal and the second branch modulated spread spectrum signal to obtain a modulation and expansion corresponding to the one modulation spread spectrum device 55.
  • the frequency signal is output to the first combining device 54.
  • the XI, XQ, YI, and YQ signals shown in FIG. 8 or FIG. 9 are low-speed data signals obtained by serial-to-parallel conversion of the high-speed data signals by the serial-to-parallel converter 52, and Code is the corresponding spread spectrum. The code is not described in detail in the embodiment of the present invention.
  • the second branching device may be any branching device capable of splitting a corresponding one subcarrier into two branch subcarriers, such as a coupler, a splitter, or the like;
  • the circuit device may be any combination device such as a coupler or a combiner capable of combining the first branch modulated spread spectrum signal and the second branch modulated spread spectrum signal into one modulated spread spectrum signal.
  • the phase shifter may be any phase shifting of two subcarriers capable of shifting two subcarriers of one subcarrier into two subcarriers having a certain phase difference (eg, 180 degrees, etc.) device. If the phase difference of the two subcarriers is required to be 180 degrees, the phase of the first subcarrier of the two subcarriers can be kept unchanged, and only the second subcarrier of the two subcarriers is phase shifted by 180 degrees.
  • phase difference of the two subcarriers is required to be 180 degrees, the phase of the first subcarrier of the two subcarriers can be kept unchanged, and only the second subcarrier of the two subcarriers is phase shifted by 180 degrees.
  • the first branch subcarrier of the two branch subcarriers may be phase shifted by 90 degrees
  • the second branch subcarrier may be phase shifted by -90 degrees
  • the first branch subcarrier of the two branch subcarriers may be phase shifted by -90 degrees
  • the phase difference between the two subcarriers is 180 degrees
  • the phase difference between the two subcarriers is 180 degrees.
  • first and second dual-electrode modulators may be any modulators capable of both data modulation and amplitude modulation of one carrier by using a data signal and a spreading code, such as EAM;
  • the first and second dual-electrode modulators can flexibly change the order of data modulation and amplitude modulation of one carrier, as long as the two signals (data signals, spreading codes, etc.) are used in the electrodes for receiving the corresponding signals. It is to be interchanged, and the embodiment of the present invention does not repeat this.
  • the data flow modulation and amplitude spread spectrum modulation of one subcarrier are taken as an example, and the workflow of the modulation spread spectrum device 55 having the two-electrode modulator is specifically described.
  • the first low speed data signal corresponding to the path subcarrier is utilized in the path subcarrier.
  • the expression of the obtained first branch modulation signal may be (Data 1 + P1) e j ⁇ t , where e j ⁇ t represents the subcarrier of the path.
  • the power offset point in the amplitude spread spectrum modulation is assumed to be P2
  • the first branch modulated signal is amplitude-spread modulated by using the first spreading code corresponding to the way subcarrier.
  • the expression of the obtained first branch modulated spread spectrum signal may be (Code 1 + P2) (Data 1 + P1) e j ⁇ t .
  • the obtained data is obtained.
  • the expression of the second branch modulated spread spectrum signal may be (-Code 1 + P2) (-Data 1 + P1) e j ⁇ t .
  • the first branch modulated spread spectrum signal and the second branch modulated spread spectrum signal are combined to obtain a modulated spread spectrum signal corresponding to the path subcarrier, wherein the expression of the modulated spread spectrum signal may be (Code 1 ⁇ Data 1 + P1 ⁇ P2) e j ⁇ t , P1 ⁇ P2 are residual carrier power after data modulation and amplitude spread modulation. It can be seen that the modulated spread spectrum signal after the combination is the correct modulated spread spectrum signal, thereby indicating that the correct data modulation and spread spectrum are realized.
  • the N way spreading codes may be mutually orthogonal bipolar binary spreading sequences.
  • each of the N-channel spreading codes may be a real sequence such as a Walsh code or an OVSF code; of course, in order to obtain a more uniform spectrum, each of the spreading codes may also be set based.
  • the pseudo-random sequence code is a sequence code generated by scrambling a real sequence such as a Walsh code or an OVSF code, and the like, which is not limited in this embodiment of the present invention.
  • the signal transmitting device can split the N-channel subcarriers having the same wavelength by the first branching device, and utilize N modulation spreads.
  • the N-channel low-speed data signal obtained by serial-to-parallel conversion of the received high-speed data signal by the frequency device and the serial-to-parallel converter, and the set N-way spreading code perform corresponding data modulation and amplitude expansion on the N-subcarrier subcarrier
  • the frequency modulation obtains an N-way modulated spread spectrum signal, and then combines and outputs the N-channel modulated spread spectrum signal by using the first combining device.
  • low-speed DACs with high ENOB and other low-bandwidth electrical devices can be used for data signal processing, which can effectively reduce the quantization noise and other electrical appliances of the DAC.
  • the electrical noise of the piece improves the performance of the high-order QAM modulation system.
  • the optical carrier when the optical carrier is split, it is not necessary to use a multi-carrier generating device and a multi-channel allocator having a complicated structure, and when performing spreading, it is not necessary to adopt a plurality of delay units or
  • the phase modulation mode of the controllable phase unit can effectively solve the problems of high cost and difficult implementation in the existing methods for improving the reliability of the QAM system on the basis of improving the reliability of the system.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the fourth embodiment of the present invention provides a signal receiving device, specifically, as shown in FIG. 10, which is the structure of the signal receiving device according to the fourth embodiment of the present invention.
  • the signal receiving device may include OEC101, ADC102, and DSP103:
  • the OEC 101 is configured to receive a signal transmitted by the signal transmitting device, and convert the received signal into an electrical signal and output the signal to the ADC 102.
  • the signal is generated by the signal transmitting device by using a shunt device After the single-wavelength optical carrier is split into N sub-carriers with the same wavelength, data modulation and amplitude spread spectrum modulation are performed on the N-channel subcarriers based on the N low-speed data signals and the N-way spreading codes, to obtain an N-way modulation spread. a frequency signal obtained by combining the N-channel modulated spread spectrum signals;
  • the ADC 102 is configured to receive an electrical signal output by the OEC 101, and convert the electrical signal into a digital signal and output the signal to the DSP;
  • the DSP 103 is configured to receive a digital signal output by the ADC 102, and despread the digital signal based on an N-channel spreading code to obtain an N-way despread signal, and each of the N-channel despread signals One despreading signal is low-pass filtered to obtain N data signals; the N is a positive integer not less than 2.
  • the digital signal can be solved based on the N-channel spreading code used by the signal transmitting device for amplitude spread spectrum modulation. Expand to improve the accuracy of data recovery and reception.
  • N-way spreading codes may be mutually orthogonal bipolar binary spreading sequences.
  • each of the N-channel spreading codes may be a real sequence such as a Walsh code or an OVSF code; of course, in order to obtain a more uniform spectrum, each of the spreading codes may also be set based.
  • the pseudo-random sequence code is a sequence code generated by scrambling a real sequence such as a Walsh code or an OVSF code, and is not described here.
  • the DSP 103 may include N despreaders corresponding to the N way spreading codes, and N LPFs corresponding to the N despreaders one by one (Low Pass Filter, low pass filter), where:
  • Each of the N despreaders may be configured to perform, according to the one spreading code corresponding to the despreader in the N way spreading code, the received digital signal Despreading, obtaining a despread signal and outputting to the LPF corresponding to the despreader;
  • Each of the N LPFs is configured to receive a despread signal output by a corresponding despreader, The received despread signal is low-pass filtered to obtain a data signal.
  • the despreader may be any despreading device capable of despreading the spread spectrum signal, such as a multiplier, and is not limited in this embodiment of the present invention. Specifically, when the despreader is a multiplier, it can achieve despreading of the spread spectrum signal by multiplying the received digital signal by a corresponding spreading code to improve data recovery and reception. Sex.
  • the DSP 103 in the signal receiving device may also adopt The implementation structure shown in Figure 12 is used to perform multiple access crosstalk cancellation and data recovery.
  • the DSP can also include a multiple input multiple output filter:
  • the multiple input multiple output filter can be used to adaptively filter each of the N data signals (ie, the data signals output by the N LPFs) to obtain N-channel adaptive filtering. Data signals to improve the accuracy of data recovery and reception.
  • the multiple input multiple output filter may be any filtering device capable of adaptively filtering multiple input signals to eliminate multiple access crosstalk, such as a MIMO FIR (Multiple Input Multiple Output Finite Impulse Response) filter, and the present invention
  • MIMO FIR Multiple Input Multiple Output Finite Impulse Response
  • the embodiment does not limit this.
  • the filter coefficients of the MIMO FIR can be calculated by using a CMA (Constant Modulus Algorithm) or an LMS (Least Mean Square) algorithm, and are not described here.
  • the DSP may further include N phase restorers that are in one-to-one correspondence with the N-channel adaptively filtered data signals:
  • Each of the N phase restorers is configured to perform carrier phase recovery on an adaptively filtered data signal corresponding to the phase restorer to obtain a data signal after phase recovery of the carrier. To improve the accuracy of data recovery and reception.
  • the DSP may further include a dispersion compensator, that is, CDC (Chromatic Dispersion Compensation):
  • the dispersion compensator may be configured to perform dispersion compensation on the received digital signal before despreading the received digital signal, and output a dispersion-compensated digital signal to the N despreaders to eliminate the influence of dispersion on the digital signal and improve the accuracy of data recovery and reception.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • the fifth embodiment of the present invention provides a signal transmission system, specifically, as shown in FIG.
  • the signal transmission system can include a signal transmitting device 151 and a signal receiving device 152:
  • the signal transmitting device 151 is configured to generate a single-wavelength optical carrier, and split the single-wavelength optical carrier into N-channel subcarriers with the same wavelength based on the shunting device, and, according to the N low-speed data signal and the N-way spread spectrum a code, performing data modulation and amplitude spread spectrum modulation on the N subcarriers, obtaining an N-way modulated spread spectrum signal, and combining the obtained N-channel modulated spread spectrum signals into a combined signal to be output to the signal receiving device 152;
  • the value of N is a positive integer not less than 2, and the N-way spreading code has a one-to-one correspondence with the N-channel subcarriers, and the N-channel low-speed data signal and the N-channel subcarrier are one-to-one.
  • the N low-speed data signals are obtained by serial-to-parallel conversion of the received high-speed data signals;
  • the signal receiving device 152 is configured to receive a signal transmitted by the signal transmitting device 151, perform photoelectric conversion and analog digital conversion processing on the received signal, obtain a digital signal, and, based on the N-channel spread spectrum
  • the code despreads the digital signal to obtain an N-channel despread signal, and performs low-pass filtering on each of the N despread signals to obtain N data signals.
  • embodiments of the present invention can be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention may employ computer-usable storage media (including but not limited to disks) in one or more of the computer-usable program code embodied therein. The form of a computer program product implemented on a memory, CD-ROM, optical memory, or the like.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

L'invention concerne un procédé de transmission de signal, un procédé de détection de signal, et un dispositif et un système associés. Selon l'invention, une porteuse optique à longueur d'onde unique générée peut être divisée, au moyen d'un dispositif de dérivation, en N trajets de sous-porteuses avec la même longueur d'onde, et N trajets de signaux de données à basse vitesse obtenus via l'exécution d'une conversion série-parallèle sur des signaux de données à grande vitesse reçus, et N trajets de codes d'étalement de spectre sont utilisés pour exécuter une modulation de données et une modulation d'étalement de fréquence d'amplitude correspondantes sur les N trajets des sous-porteuses afin d'obtenir N trajets de signaux à spectre étalé modulé, ce qui permet de combiner les N trajets de signaux à étalement du spectre modulé et de les envoyer. Lorsqu'une porteuse optique est dérivée, il est inutile d'adopter un appareil de génération multi-porteuses avec une structure plus complexe, etc. ;de plus, lorsqu'une fréquence est étalée, il est inutile d'adopter un procédé de modulation de phase nécessitant une pluralité d'unités à retard ou d'unités à phase réglable, ce qui permet de résoudre les problèmes existants liés au coût relativement élevé de l'amélioration de la fiabilité d'un système QAM, à sa difficulté de réalisation, etc.
PCT/CN2015/094923 2015-11-18 2015-11-18 Procédé de transmission de signal, procédé de détection de signal, et dispositif et système associés Ceased WO2017084046A1 (fr)

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PCT/CN2015/094923 WO2017084046A1 (fr) 2015-11-18 2015-11-18 Procédé de transmission de signal, procédé de détection de signal, et dispositif et système associés
EP15908543.0A EP3367593B1 (fr) 2015-11-18 2015-11-18 Procédé de transmission de signal, procédé de détection de signal, et dispositif et système associés
US15/982,930 US10374722B2 (en) 2015-11-18 2018-05-17 Signal transmitting method, signal receiving method, and related device and system
US16/517,214 US10958352B2 (en) 2015-11-18 2019-07-19 Signal transmitting method, signal receiving method, and related device and system

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CN110463090A (zh) * 2017-08-16 2019-11-15 华为技术有限公司 一种光发射机、光接收机及光传输方法

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US10374722B2 (en) 2019-08-06
CN108352903A (zh) 2018-07-31
US10958352B2 (en) 2021-03-23
US20180287708A1 (en) 2018-10-04
EP3367593A4 (fr) 2018-11-14
CN108352903B (zh) 2020-11-17
EP3367593B1 (fr) 2021-04-07
EP3367593A1 (fr) 2018-08-29

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